To be completely honest, I've followed Three A Light for a number of years and only recently decided to purchase the nutrient package. I preordered a book and have been using the knowledge gained in my own approach at growing cannabis. I was blown away by the difference in simply understanding what was going on within in the plant and why. So after finally purchasing the nutrients, it was only a matter of 2 days before there was a SIGNIFICANT change in the plants. I started using the line the end of my veg cycle and am now into early flower. The plants are responding extremely well to the line. I highly recommend that you always give it a try, you will see the difference.